_diagnostics - cruise control
TRANSCRIPT
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0526X05
05742DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
907 Author: Date:
2004 COROLLA (RM1037U)
CRUISE CONTROL SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS (See page 05744)
3 CHECK AND CLEAR DTC (See page 05745)
4 PROBLEM SYMPTOM CONFIRMATION
SYMPTOM DOES NOT OCCUR (GO TOSTEP 5)
SYMPTOM OCCUR (GO TO STEP 6)
5 SYMPTOM SIMULATION (See page 0120)
6 DTC CHECK (See page 05745)
MALFUNCTION CODE (GO TO STEP 7)
NORMAL CODE (GO TO STEP 8)
7 DTC CHART (See page 05750)
GO TO STEP 9
8 PROBLEM SYMPTOMS TABLE (See page 05754)
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DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05743
908 Author: Date:
2004 COROLLA (RM1037U)
9 CIRCUIT INSPECTION (See page 05755 05788)
10 IDENTIFICATION OF PROBLEM
11 PARTS INSPECTION
12 REPAIR
13 CONFIRMATION TEST
END
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057SB01
CRUISE CONTROL SYSTEM Check Sheet
Inspectors name:
Registration No.Registration Year
Frame No.
Odometer ReadingMile
Customers Name
Date VehicleBrought in
Condition of
Problem
Occurrence
Date of Problem
How Often does
Occurrence
Problem Occur?
Vehicle Speed whenProblem Occurred
V Auto cancel
occurs
V Cancel does not
occur
Symptoms
V Normal Code V Malfunction Code (Code )V Normal Code V Malfunction Code (Code )
km/ /
V Continuous V Intermittent (Times a day)
Milekm
FDriving condition
V City driving V Freeway V Up hill V Down hill
FAfter cancel occurred, did the driver activate cruise control
again?
V Yes V No
V Brake pedal depressed
V Except D position shift (A/T)
V Clutch pedal depressed (M/T)
V At 40km/h (25 mph) or less
V When control main switch turns to CANCEL position
V Slip to acceleration side
V Slip to deceleration side
V Hunting occurs
V O/D cut off does not occur
V O/D does not return
V Cruise control
malfunction
V SET V ACCEL V COAST V RESUME V CANCELV Switch
malfunction
V Remains ON V Does not light up V BlinkingV CRUISE main
indicator light
DTC Check 1st Time2nd Time
/ /
05744DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
909 Author: Date:
2004 COROLLA (RM1037U)
CUSTOMER PROBLEM ANALYSIS CHECK
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057SC02
I32591
F40034
DLC3
1 2 3
10 11 1312
4 5 6 7 8
159 1614
CG
Tc
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05745
910 Author: Date:
2004 COROLLA (RM1037U)
PRECHECK1. PRECHECK
(a) Check that the cruise control actuator assy, acceleration wire, accelerator auto drive cable assy, and
link assy are installed correctly and that the wire and link are securely connected.
(b) Check that the operating movement of the acceleration pedal, cruise control actuator assy, accelera-
tion wire, accelerator auto drive cable assy and link is smooth.
(c) Adjust the acceleration auto drive cable assy and link system not to allow any play or excessive ten-
sion.
(d) Check that the cruise control ECU assy, cruise control actuator assy, cruise control main switch assy
and connectors of each cancel switch are connected securely.
(e) When turning on the main switch of the cruise control main switch assy by pressing the button with
the ignition switch to ON, check that the CRUISE main indicator light in the accessory meter assy lights
up.
2. DIAGNOSIS SYSTEM(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE main indicator light comes
on when the cruise control main switch button is
turned ON, and that the indicator light goes off when
the main switch button is turned OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page 05638) for the combination meter
section.
(b) Check the DTC using diagnosis check wire.
(1) Turn the ignition switch to ON.
(2) Using SST, connect terminals Tc and CGof DLC3.
SST 0984318040
(3) Read the DTC on the CRUISE main indicator light.
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BE4032
BE4033 I30407
Normal Code
0.25 sec.
0.25 sec.
ON
OFF
ON
OFF
4 sec. 1.5 sec.
0.5 sec.
2.5 sec.
0.5 sec.
1.5 sec.
Malfunction codes 11 and 21
Code 11 Code 21
I30568
CG
Tc
(b) DLC3 (d) 5 times
within 3 seconds
(c)
05746DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
911 Author: Date:
2004 COROLLA (RM1037U)
HINT:
If the DTC is not output, inspect the diagnosis circuit (See page
05788).
As an example, the blinking patterns for codes are shown in the
illustration; normal, 11 and 21.
3. USING HANDHELD TESTER
(a) Hook up the handheld tester to the DLC3.
(b) Monitor the ECU data by following the prompts on the tester screen.
HINT:
The handheld tester has a Snapshot function which records the monitored data.
Please refer to the handheld tester operators manual for further details.
4. DTC CLEARANCE (ERASE MODE)
HINT:
During in the erase mode, diag detection does not work.
(a) Drive at about 15 km/h or below.
(b) Using SST, connect terminals Tc and CGof DLC3.
SST 0984318040
(c) Pull the cruise control main switch assy to CANCEL.(d) On the above mentioned condition, press on the cruise
control main switch button 5 times within 3 seconds.
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N17520
(1)
(3)
N17520
(1)
(3)
N17520
(1)
(3)
N17520
(1)
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05747
912 Author: Date:
2004 COROLLA (RM1037U)
5. PROBLEM SYMPTOM CONFIRMATION
(ROAD TEST)
(a) Inspect the SET switch.
(1) Press the cruise control main switch button to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).(3) Push down the cruise control main switch assy to
the SET/COAST.
(4) After releasing the switch, check that the vehicle
cruises at the desired speed.
(b) Inspect the ACCEL switch.
(1) Press the cruise control main switch button to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Check that the vehicle speed is increases while the
cruise control main switch assy is pull up to RES/ACC, and that the vehicle cruises at the set speed
when the switch is released.
(4) Momentarily press the cruise control main switch
assy upward, to the RES/ACC and then immediate-
ly release it. Check that the vehicle speed increases
by about 1.5 km/h (Tapup function).
(c) Inspect the COAST switch.
(1) Press the cruise control main switch button to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Check that the vehicle speed is decreases while the
cruise control main switch assy is push down to
SET/COAST, and the vehicle cruises at the set
speed when the switch is released.
(4) Momentarily push the cruise control main switch
assy downward to SET/COAST, and then immedi-
ately release it. Check that the vehicle speed de-
creases by about 1.5 km/h (Tapdown function).
(d) Inspect the CANCEL switch.
(1) Press the cruise control main switch button to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
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N17520
(1)
(3)
N17520
(a), (d)
(b), (g)(a), (d)
05748DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
913 Author: Date:
2004 COROLLA (RM1037U)
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
S Depress the brake pedal.
S Depress the clutch pedal (M/T).
S Shift to except D position (A/T).S Press the cruise control main switch button to
OFF.
S Pull the cruise control main switch assy to
CANCEL.
(e) Inspect the RESUME switch.
(1) Press the cruise control main switch button to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that thenormal driving mode is reset.
S Depress the brake pedal.
S Depress the clutch pedal (M/T).
S Shift to except D position (A/T).
S Pull the cruise control main switch assy to
CANCEL.
(4) After the cruise control main switch assy is pull up
to RES/ACC at the driving speed of more than 40
km/h (25 mph), check that the vehicle restores the
speed before the cancellation.
6. INPUT SIGNAL CHECK
HINT:
S For check No.1 No.3
Turn the ignition switch to ON.
S For check No.4
Jack up the vehicle.
Start the engine.
Release the clutch pedal (M/T).
Shift to D position (A/T).
(a) Keep the cruise control main switch assy to SET/COASTor RES/ACC position and hold it down or hold it up.
(b) Press the cruise control main switch button to ON.
(c) Check that the CRUISE main indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Turn the SET/COAST or RES/ACC switch to OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE main indicator
light.
(g) After performing the check, turn the cruise control main
switch button to OFF.
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No. Operation MethodCRUISE main Indicator LightBlinking Pattern
Diagnosis
1 Turn SET/COAST switch ON
2 Turn RES/ACC switch ON
3
Turn CANCEL switch ON
Depress brake pedal
(Turn stop lamp switch assy ON)
Shift to except D position(Turn PNP switch OFF)
4
Drive at about 40 km/h(25 mph) or higher
Drive at about 40 km/h
(25 mph) or below
LightON
OFF
LightON
OFF
LightON
OFF
Switch ON
Switch OFF
LightON
OFF
Switch OFF
Switch ON
SET/COAST switch circuitis normal
RES/ACC switch circuitis normal
CANCEL switch circuitis normal
Stop light switch circuit
is normal
PNP switch circuit isnormal
Vehicle speed sensor isnormal
LightON
OFF
LightON
OFF
1sec.
0.25 sec. 0.25 sec.
Depress clutch pedal(Turn clutch switch assy OFF)
Clutch switch circuitis normal
BE4034
Indicator Light
1.5 sec. 0.5 sec.
ON
OFF
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05749
914 Author: Date:
2004 COROLLA (RM1037U)
HINT:
When 2 or more signals are input to the cruise control ECU
assy, the lowest numbered code will be displayed first.
7. AUTO CANCEL FUNCTION
(a) If a malfunction occurs in the No.1 vehicle speed sensors
or actuator, etc. during cruise control driving, the ECU ac-
tuates AUTO CANCEL of the cruise control and turns ON
and OFF the CRUISE main indicator light to inform the
driver of a malfunction. At the same time, the malfunction
is stored in memory as a diagnostic trouble code.
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0527005
05750DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
915 Author: Date:
2004 COROLLA (RM1037U)
DIAGNOSTIC TROUBLE CODE CHARTIf a malfunction code is displayed during the DTC check, check the circuit listed for the code. For details of
each code, turn to the page referred to under the See page for respective DTC No. in the DTC chart.
DTC No.
(See Page)Detection Item Trouble Area
11
(05755)SShort in actuator motor circuit.
SCruise control actuator assy (Actuator motor)
SActuator motor circuit
SCruise control ECU assy
12
(05757)
SShort in actuator magnetic clutch circuit.
SOpen (0.8 sec.) in actuator magnetic clutch circuit.
SSTOP Fuse
SStop lamp switch assy
SCruise control actuator assy (Actuator magnetic clutch)
SActuator magnetic clutch circuit
SCruise control ECU assy
15
(05755)SOpen in actuator motor circuit. SCruise control actuator assy (Actuator motor)
14
(05760)S
Cruise control actuator assy mechanical malfunction.
SCruise control actuator assy (Actuator motor)
(Actuator lock: motor, arm)SCruise control ECU assy
21
(05763)
SSpeed signal is not input to the cruise control ECU assy while
cruise control is set.
SCombination meter assembly
SVehicle speed sensor
SVehicle speed sensor circuit
SCruise control ECU assy
23
(05763)SVehicle speed sensor pulse is abnormal.
SVehicle speed sensor
SCruise control ECU assy
41 SCruise control ECU SCruise control ECU assy
42 SSource voltage drop SPower source
51
(05765)SShort in idle signal circuit.
SThrottle position sensor
S
Idle signal circuitSECM
SCruise control ECU assy
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057SD02
I30419
C14
05752DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
917 Author: Date:
2004 COROLLA (RM1037U)
TERMINALS OF ECU
Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)
+BGND
(C142C1416)BWWB Ignition switch ON 10 16
STPGND Depress brake pedal 10 16
(C143C1416)GWWB
Release brake pedal Below 1
SDepress clutch pedal (M/T)
SShift to except D position (A/T)Below 1
DGND (C144C1416) LWBSRelease clutch pedal (M/T)
SShift to D position (A/T)10 16
Ignition switch ON
Cruise control main switch button ON Below 1.2
PIGND (C145C1416) GRWBIgnition switch ON
Cruise control main switch button OFF10 16
ECT (A/T)GND
During driving
Gear position 3rdBelow 1
(C146C1416)LWB
During driving
Gear position O/D8 16
MCGND
During cruise control driving
COAST switch held ON9 15
(C147C1416)RLWB
During cruise control driving
ACC switch held ONBelow 1
LGND During cruise control driving 9 15
(C148C1416)GOWB
Except during cruise control driving Below 1
Ignition switch ON 10 16TCGND
(C1410C1416)PBWB Ignition switch ON
Connect terminals Tc and CG of DLC3Below 2
Ignition switch ON 10 16
Ignition switch ON
Cruise control main switch button held ONBelow 0.5
CCSGNDGYWB
Ignition switch ON
CANCEL switch held ON6.6 11.4
(C1411C1416)
Ignition switch ONSET/COAST switch held ON
4.5 8.1
Ignition switch ON
RES/ACC switch held ON2.3 4.5
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I30755
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05753
918 Author: Date:
2004 COROLLA (RM1037U)
SPDGND Engine start Car stoppage. Below 1.5 4.7 16
(C1412C1416)VWWB
During driving (Pulse generated). 3 7
IDLGND
Ignition switch ON
Throttle valve fully opened.10 16
(C1413C1416)LWWB
Ignition switch ON
Throttle valve fully closed. Below 1.5
OD (A/T)GND
During cruise control driving
O/D switch ON.0 16 (*1)
(C1414C1416)RYWB
During cruise control driving
O/D switch OFF (3rd driving)Below 1
MOGND
During cruise control driving
ACC switch held ON9 15
(C1415C1416)RGWB
During cruise control driving
COAST switch held ONBelow 1
GND Body Ground
(C1416 Body Ground)
WB Body
GroundConstant Below 1
Oscilloscope wave (*1)
HINT:
S Terminal: OD GND
S Gauge set: 5 V / DIV, 50 ms / DIV
S Condition: During cruise control driving O/D switch ON.
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0527306
05754DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
919 Author: Date:
2004 COROLLA (RM1037U)
PROBLEM SYMPTOMS TABLEIf a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem, symptom in the order given in the table below and proceed to the relevant troubleshooting page.
Symptom Suspect Area See page
SET not occurring or CANCEL occurring.
(DTC is Normal)
1. Cruise control main switch circuit (Cruise control switch)2. Vehicle speed sensor circuit
3. Stop lamp switch circuit
4. Park/neutral position switch circuit (A/T)
Clutch switch circuit (M/T)
5. Actuator motor circuit
6. Cruise control cable
7. Cruise control ECU assy
0578605763
05767
05773
05776
821
0130
SET not occurring or CANCEL occurring.
(DTC dose not output)
1. ECU power source circuit
2. Cruise control ECU assy
05779
0130
Actual vehicle speed deviates above or below the set speed.
1. Cruise control cable
2. Vehicle speed signal abnormal
3. Electronically controlled transmission communicationcircuit (A/T)
4. Actuator motor circuit
5. Idle signal circuit (Main throttle position sensor)
6. Cruise control ECU assy
821
05763
05770
05755
05765
0130
A/T:
Gear shifting frequent between 3rd and O/D when driving on uphill
road. (Hurting)
1. Electronically controlled transmission communication
circuit
2. Cruise control ECU assy
05770
0130
Cruise control not cancelled, even when brake pedal is de-
pressed.
1. Cruise control cable
2. Stop lamp switch circuit
3. Actuator motor circuit
4. Cruise control ECU assy
821
05767
05755
0130
A/T:
Cruise control not cancelled, even when transmission is shifted to
N position.
1. Cruise control cable
2. Park/neutral position switch circuit
3. Actuator motor circuit
4. Cruise control ECU assy
821
05773
05755
0130
Control switch does not operate.
(SET/COAST, ACC/RES, CANCEL not possible)
1. Cruise control cable
2. Actuator motor circuit
3. Cruise control ECU assy
821
05755
0130
SET possible at 40 km/h (25 mph) or less, or CANCEL does not
operate at 40 km/h (25 mph) or less.
1. Cruise control cable
2. Vehicle speed signal abnormal
3. Actuator motor circuit
4. Cruise control ECU assy
821
05763
05755
0130
Poor response is ACCEL and RESUME modes.
1. Cruise control cable
2. Electronically controlled transmission communication
circuit (A/T)
3. Actuator motor circuit
4. Cruise control ECU assy
821
05770
05755
0130
A/T:
O/D does not RESUME, even though the road is not uphill.
1. Electronically controlled transmission communication
circuit
2. Cruise control ECU assy
05770
0130
DTC memory is erased. 1. Cruise control ECU assy 0130
DTC is not output, or is output when it should not be.1. Diagnosis circuit
2. Cruise control ECU assy
05788
0130
Cruise main indicator light remains ON or falls to light up. 1. Cruise main indicator light circuit2. Cruise control ECU assy
057860130
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I32640
Duty Ratio =A + B
X 100 (%)A
OFF
ONA
B
1 Cycle
I24192
Cruise Control ECU Assy
MC
MO
C4
Cruise Control Actuator Assy
RG1
2
15
MO
MC
RL7
M RG
RLC14
C14
12
IA5
4
IA5
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05755
920 Author: Date:
2004 COROLLA (RM1037U)
DTC 11 ACTUATOR MOTOR CIRCUIT
DTC 15 ACTUATOR MOTOR CIRCUIT
CIRCUIT DESCRIPTIONThe actuator motor is operated by signals from the cruise control ECU assy. Acceleration and deceleration
signals are transmitted by changes in the Duty Ratio (See below).
Duty Ratio:
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity
in one cycle, and B is the period of noncontinuity, then.
DTC No. DTC Detecting Condition Trouble Area
11 SShort in actuator motor circuit.
SCruise control actuator assy (Actuator motor)
SActuator motor circuit
SCruise control ECU assy
15 SOpen in actuator motor circuit. SCruise control actuator assy (Actuator motor)
WIRING DIAGRAM
0527405
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I30416
MC () MO (+)
05756DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
921 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 INSPECT CRUISE CONTROL ACTUATOR ASSY
(a) Turn the ignition switch to OFF.
(b) Disconnect the cruise control actuator assy connector.
(c) Measure the resistance between terminals 1 (MO) and 2
(MC) of cruise control actuator assy.
HINT:
If control plate position is fully opened or fully closed, resistance
cannot be measured.
OK:
Resistance: More than 4.2
NG REPLACE CRUISE CONTROL ACTUATORASSY
OK
2 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND CRUISE CONTROL ACTUATOR ASSY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and cruise
control actuator assy (actuator motor) (See page 0130).
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24193
S9Stop Lamp SwitchAssy
Instrument Panel J/BCruise Control ECU Assy
S9Stop Lamp Switch Assy
C4Cruise Control
Actuator Assy
Engine Room J/B
RH J/B
Battery
FL MAIN
J6J/C
ALT
STOP
STP
L
IC
1
IL
14
IB
2
5GW
RW
3C
13 12
IC
1
1
GW GW3
3C C14
C14
8
B GO RYW
13
4B
3
IA5
A
IE
WB21
1A 1C
GOIA5
13
44B
WB WB
11
W
3 4
GND L
1 2
3
Center J/B
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05757
922 Author: Date:
2004 COROLLA (RM1037U)
DTC 12 ACTUATOR MAGNETIC CLUTCH CIRCUIT
CIRCUIT DESCRIPTIONThis circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop lamp switch assy turns ON, supplying electrical power to the
stop light. Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 8 km/h (5 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 5 km/h (3 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No. DTC Detecting Condition Trouble Area
12
SShort in actuator magnetic clutch circuit.
SOpen (0.8 sec.) in actuator magnetic clutch circuit.
SSTOP Fuse
SStop lamp switch assy
S
Cruise control actuator assy (Actuator magnetic clutch)SActuator magnetic clutch circuit
SCruise control ECU assy
WIRING DIAGRAM
057SE02
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I32648
Instrument Panel J/B
STOP Fuse
I04062
2 1
4 3
Push in Free
05758DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
923 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 INSPECT FUSE(STOP)
(a) Turn the ignition switch to OFF.
(b) Remove the STOP fuse from the instrument panel J/B.
(c) Check continuity of the STOP fuse.
OK: Continuity
NG REPLACE FUSE
OK
2 INSPECT STOP LAMP SWITCH ASSY
(a) Disconnect the stop lamp switch assy connector.
(b) Check continuity between each terminal of stop lamp
switch assy.
OK:
Stop Lamp Switch Assy Terminal Specification
Brake pedal depressed 1 2 Continuity
(Switch pin free) 3 4 No continuity
Brake pedal released 1 2 No continuity
(Switch pin pushed in) 3 4 Continuity
NG REPLACE STOP LAMP SWITCH ASSY
OK
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I30416
GND () L (+)
I30416
GND
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05759
924 Author: Date:
2004 COROLLA (RM1037U)
3 INSPECT CRUISE CONTROL ACTUATOR ASSY
(a) Turn the ignition switch to OFF.
(b) Disconnect the cruise control actuator assy connector.
(c) Measure resistance between terminals 3 (L) and 4 (GND)
of the cruise control actuator assy.OK:
Resistance: 34.65 42.35
NG REPLACE CRUISE CONTROL ACTUATORASSY
OK
4 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ACTUATORASSY AND BODY GROUND)
(a) Check continuity between the terminal 4 (GND) of the
cruise control actuator assy and body ground.
OK: Continuity
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
5 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND CRUISE CONTROL ACTUATOR ASSY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and cruise
control actuator assy (actuator magnetic clutch) (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I32644
C4
Cruise Control Actuator AssyCruise Control ECU Assy
IA5
IA5
IA5
12
15
8
7
4
13
C14
C14
C14
RL
RG
GO
MC
MO
L
MC 2
MO 1
L 34 GND
WBIA5
3WB
4B
13
4B
21
Center J/B
WB
J6
J/C
IE
A
RY
RL
RG
GO
34
S9Stop Lamp Switch Assy
05760DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
925 Author: Date:
2004 COROLLA (RM1037U)
DTC 14 ACTUATOR MECHANICAL MALFUNCTION
CIRCUIT DESCRIPTIONThe circuit detects the rotation position of the actuator control plate and sends a signal to the cruise control
ECU assy.
DTC No. DTC Detecting Condition Trouble Area
14 SCruise control actuator assy mechanical malfunction.
SCruise control actuator assy (Actuator motor)
(Actuator lock: motor, arm)
SCruise control ECU assy
WIRING DIAGRAM
0527605
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20/48
I30416
GND ()
L (+)
I32645
GND ()
L (+)
Fully Open Side
MC ()
MO (+)
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05761
926 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 INSPECT CRUISE CONTROL ACTUATOR ASSY
(a) Inspect the cruise control actuator arm locking operation.
(1) Turn the ignition switch to OFF.
(2) Disconnect the cruise control actuator assy con-
nector.
(3) Connect the positive (+) lead from the battery to the
terminal 3 (L) of cruise control actuator assy and the
negative () lead to terminal 4 (GND).
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. You will damage the cruise control actuator
assy.
(4) Move the control plate by hand.
OK:Control plate does not move.
(b) Inspect the cruise control actuator assy operation.
(1) Turn the ignition switch to OFF.
(2) Disconnect the cruise control actuator assy con-
nector.
(3) Connect the positive (+) lead from the battery to ter-
minals 1 (MO) and 3 (L) of cruise control actuator
assy, connect the negative () lead to terminals 2
(MC) and 4 (GND) of cruise control actuator assy.
OK:Control arm moves to full open side.
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I32646
GND () MC (+)
MO ()
Fully Closed Side
L (+)
05762DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
927 Author: Date:
2004 COROLLA (RM1037U)
(4) Connect the positive (+) lead from the battery to ter-
minals 2 (MC) and 3 (L) of cruise control actuator
assy, connect the negative () lead to terminals 1
(MO) and 4 (GND) of cruise control actuator assy.
OK:
Control arm moves to full close side.
NG REPLACE CRUISE CONTROL ACTUATORASSY
OK
2 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND CRUISE CONTROL ACTUATOR ASSY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and cruise
control actuator assy (actuator motor) (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24194
C9
Combination Meter Assembly
Center J/B
Cruise Control ECU Assy
From
Skid Control ECU
Assy
From
Vehicle Speed
Sensor
*1: w/ ABS
*2: w/o ABS
VWSPD
8 12
10C14
9
4C
4
7
(*2)
IA3
10WG
II2
(*1)
WG WG
(*1)
WG
(*2)
WG
4CVW
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05763
928 Author: Date:
2004 COROLLA (RM1037U)
DTC 21 OPEN VEHICLE SPEED SENSOR CIRCUIT
DTC 23 VEHICLE SPEED SIGNAL ABNORMAL
CIRCUIT DESCRIPTIONThe vehicle speed sensor circuit is sent to cruise control ECU assy as a vehicle speed signal. For each rota-
tion of the shaft, the vehicle speed sensor sends a signal through the combination meter assembly to the
cruise control ECU assy (See the following chart). The cruise control ECU assy calculates the vehicle speed
from this pulse frequency.
DTC No. DTC Detecting Condition Trouble Area
21SSpeed signal is not input to the cruise control ECU assy while
cruise control is set.
SCombination meter assembly
SVehicle speed sensor
SVehicle speed sensor circuit
SCruise control ECU assy
23 SVehicle speed sensor pulse is abnormal.SVehicle speed sensor
SCruise control ECU assy
WIRING DIAGRAM
057SF02
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Input Signal
Indicator Light
Blinking Pattern
Drive at about40 km/h (25 mph)or below
Drive at about40 km/h (25 mph)or over
Light ON
OFF
LightON
OFF
05764DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
929 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 INPUT SIGNAL CHECK
(a) See input signal check on page 05745.
(b) Check indicator light operation when driving with vehicle
speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).
OK:
Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays ON
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
2 CHECK SPEEDOMETER CIRCUIT (See page 05645)
NG REPAIR OR REPLACE HARNESS, CONNECTOROR COMBINATION METER ASSEMBLY
OK
3 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND COMBINATION METER ASSEMBLY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and com-
bination meter assembly (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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N21220
Cruise Control ECU Assy
IDL
13LW
ECM
IDLO E6
16
C14
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05765
930 Author: Date:
2004 COROLLA (RM1037U)
DTC 51 IDLE SIGNAL CIRCUIT
CIRCUIT DESCRIPTIONWhen the idle switch is turned ON, a signal is sent to the cruise control ECU assy. The cruise control ECU
assy uses this signal to correct the discrepancy between the throttle valve position and the actuator positionsensor values to enable accurate cruise control at the set speed. If the idle switch is malfunctioning, problem
symptoms also occur in the engine, so also inspect the engine.
DTC No. DTC Detecting Condition Trouble Area
51 SShort in idle signal circuit.
SThrottle position sensor
S Idle signal circuit
SECM
SCruise control ECU assy
WIRING DIAGRAM
0527G06
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25/48
I30401
IDL (+)
05766DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
931 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 INSPECT TERMINAL VOLTAGE(IDL)
(a) Remove the cruise control ECU assy with connector still
connected.
(b) Disconnect the ECM connector.
(c) Turn the ignition switch to ON.
(d) Measure voltage between terminal 13 (IDL) of cruise con-
trol ECU assy connector and body ground when the
throttle valve is fully closed and fully opened.
OK:
Throttle Valve Position Voltage
Fully opened 10 16 V
Fully closed Below 1.5 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 0120)
NG
2 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND ECM)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and ECM
(See page 05638).
OK REPAIR OR REPLACE HARNESS ORCONNECTOR
NG
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 05638)
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I24193
S9Stop Lamp SwitchAssy
Instrument Panel J/BCruise Control ECU Assy
C4Cruise ControlActuator Assy
Engine Room J/B
RH J/B
Battery
FL MAIN
J6J/C
ALT
STOP
STP
L
IC
1
IL
14
IB
2
5GW
RW
3C
13 12
IC
1
1
GW GW3
3C C14
C148
B GO RYW
13
4B
3
IA5
A
IE
WB
21
1A 1C
GOIA513
44B WB WB
11
W
3 4
GND L
1 2
3
S9Stop Lamp Switch Assy
Center J/B
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05767
932 Author: Date:
2004 COROLLA (RM1037U)
STOP LIGHT SWITCH CIRCUIT
CIRCUIT DESCRIPTIONWhen the brake pedal is depressed, the stop lamp switch assy sends a signal to the cruise control ECU assy.
When the cruise control ECU assy receives this signal, it cancels the cruise control.A failsafe function is provided so that CANCEL functions normally, even if there is a malfunction in the stop
light switch circuit.
The cancel conditions are: Battery positive voltage at terminal STP.
When the brake pedal is depressed, normal battery positive voltage normally is applied through the STOP
fuse and stop lamp switch assy to terminal STP of the cruise control ECU assy, and the cruise control ECU
assy turns the cruise control to off.
If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive volt-
age and the cruise control will be turned off.
Also, when the brake pedal is depressed, the magnetic clutch circuit is cut mechanically by the stop lamp
switch assy, turning the cruise control OFF.
WIRING DIAGRAM
057SG02
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Input SignalIndicator Light
Blinking Pattern
Stop LampSwitch ON
Light
OFF
ONSW OFF
SW ON
I30401
STP (+)
05768DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
933 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 CHECK OPERATION(STOP LAMP SWTICH ASSY)
(a) Check that the stop light comes on when the brake pedal is depressed, and turns off when the brake
pedal is released.
NO INSPECT STOP LAMP CIRCUIT
YES
2 INPUT SIGNAL CHECK
(a) See input signal check on page 05745.
(b) Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes off when the brake pedal is
depressed.
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
3 INSPECT TERMINAL VOLTAGE(STP)
(a) Remove the cruise control ECU assy with connectors still
connected.
(b) Turn the ignition switch to ON.
(c) Measure voltage between terminal 3 (STP) of cruise
control ECU assy connector and body ground, when the
brake pedal is depressed and released.
OK:
Brake Pedal Voltage
Depressed 10 16 V
Released Below 1 V
NG PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
OK
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DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05769
934 Author: Date:
2004 COROLLA (RM1037U)
4 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND STOP LAMP SWITCH ASSY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and stop
lamp switch assy (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I32643
Cruise Control ECU
Assy
14
OD (A/T)
6
ECT (A/T)II1
3
ECM
OD1
S2 E4
14
RY
J2
DJ/C
J3
B
C14
C14E5
18
L L L
05770DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
935 Author: Date:
2004 COROLLA (RM1037U)
ELECTRONICALLY CONTROLLED TRANSMISSIONCOMMUNICATION CIRCUIT
CIRCUIT DESCRIPTIONWhen driving uphill under cruise control, in order to reduce the number of shifting due to ONOFF overdrive
operation and to provide smooth driving, when down shifting in the electronically controlled transmission oc-
curs, a signal to prevent upshift until the end of the uphill slope is sent from the cruise control ECU assy to
the electronically controlled transmission.
Terminal ECT of the cruise control ECU assy detects the shift change signal (output to electronically con-
trolled transmission No.2 solenoid) from the ECM.
If the vehicle slows down, also when terminal ECT of the cruise control ECU assy receives down shifting
signal, it sends a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the
number of gear shifts are reduced and gear shift points in the electronically controlled transmission are
changed.
WIRING DIAGRAM
0527A06
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I30402
OD (+)
I30401
ECT (+)
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05771
936 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 CHECK OPERATION(OVERDRIVE)
(a) Drive the vehicle after the engine warms up.
(b) Check that overdrive ON OFF occurs by an operation of the O/D switch ONOFF.
NO GO TO ELECTRONIC CONTROLLEDAUTOMATIC TRANSMISSION[ECT]
YES
2 INSPECT TERMINAL VOLTAGE(OD)
(a) Remove the cruise control ECU assy with the connector
still connected.
(b) Turn the ignition switch to ON.
(c) Disconnect the cruise control ECU assy connector.
(d) Measure voltage between terminal 14 (OD) of harness
side connector of cruise control ECU assy and body
ground.
OK:
Voltage: 10 14 V
NG Go to step 5
OK
3 INSPECT TERMINAL VOLTAGE(ECT)
(a) Connect the cruise control ECU assy connector.
(b) Perform the test drive after engine warms up.
(c) Check voltage between terminal 6 (ECT) of cruise control
ECU assy connector and body ground when O/D switch
is ON and OFF.
OK:
O/D Switch Position Voltage
ON Below 0.5 V
OFF 8 16 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
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05772DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
937 Author: Date:
2004 COROLLA (RM1037U)
4 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and elec-
tronically controlled transmission solenoid (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
5 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND ECM)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and ECM
(See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24199
Cruise Control ECU Assy
RW
4
J7
J/C
J4J/C
A2Park/NeutralPosition Switch
RH J/B
Instrument Panel J/B
I10Ignition SW
Engine Room J/B
IG1 RelayGAUGE
AM1
Battery FL MAIN
ALT
D (A/T)C14L
3C
19
2220
3B
II1
II2
3 7B
1D 1C
A
B
4 20
3C
3B
14RWRW
LLRW
W
IH
IB
1A
IA
IF
IG
IFIG1
BY
AM1
WB
RW
1
5 3
2
W W
1
1
1
1
2
2
12
10
1
B
1 2
1 2
W
IG
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05773
938 Author: Date:
2004 COROLLA (RM1037U)
PARK/NEUTRAL POSITION SWITCH CIRCUIT
CIRCUIT DESCRIPTIONWhen the shift position is put in except D position, a signal is sent from the park/neutral position switch to
the cruise control ECU assy. When this signal is input during cruise control driving, the ECU cancels thecruise control.
WIRING DIAGRAM
057SH02
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33/48
Input Signal Indicator LightBlinking Pattern
Turn PNP SwitchOFF (Shift to posi-
tions except D)
LightON
OFF
SW ON
SW OFF
I30401
D (+)
05774DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
939 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 CHECK OPERATION(STARTER)
(a) Check that the starter operates normally and that the engine starts.
NO GO TO ENGINE TROUBLESHOOTING
YES
2 INPUT SIGNAL CHECK
(a) See input signal check on page 05745.
(b) Check the indicator light when shifting into except D posi-
tion.
OK:
The indicator light goes off when shifting into except
D position.
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
3 INSPECT TERMINAL VOLTAGE(D)
(a) Turn the ignition switch to ON.
(b) Measure voltage between terminal 4 (D) of cruise control
ECU assy connector and body ground when shifting into
D position and other positions.
OK:
Shift Position Voltage
D position 10 16 V
Other positions Below 1 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
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DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05775
940 Author: Date:
2004 COROLLA (RM1037U)
4 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND PARK/NEUTRAL POSITION SWITCH)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and park/
neutral position switch (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24200
C13
Clutch Switch AssyCruise Control ECU Assy
Instrument Panel J/B
I10Ignition SW
Engine Room J/B
Battery FL MAIN
ALT
GAUGE
AM1
IG1 Relay
AM1 IG1
J7
J/C
D (M/T)C14L
RH J/B
RW14
IA51 2
5
3C
4
BY
IB
1DW
A
IA
IF
IG
IH
17 19
22
3B
IF
B
RW
WB
5
1C
1A
1
23
W1
1
1
11
12
10
2
2
21
IA5 3B
3C
19RW
RW
LL
RW
W
1 2
W
IG
05776DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
941 Author: Date:
2004 COROLLA (RM1037U)
CLUTCH SWITCH CIRCUIT
CIRCUIT DESCRIPTIONWhen the clutch pedal is depressed, the clutch switch sends a signal to the cruise control ECU assy. When
the signal is input to the cruise control ECU assy during cruise control driving, the cruise control ECU assycancels the cruise control.
WIRING DIAGRAM
057SI02
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36/48
Input Signal Indicator LightBlinking Pattern
Clutch SwitchOFF (Depressclutch pedal)
Light ON
OFF
SW ON
SW OFF
I30401
D (+)
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05777
942 Author: Date:
2004 COROLLA (RM1037U)
1 INPUT SIGNAL CHECK
(a) See the input signal check on page 05745.
(b) Check the indicator light when the clutch pedal is de-
pressed.
OK:The indicator light goes off when the clutch pedal is
depressed.
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
2 INSPECT TERMINAL VOLTAGE(D)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between terminal 4 (D) of the cruise
control ECU assy connector and the body ground when
the clutch pedal is depressed and released.
OK:
Clutch Pedal Voltage
Clutch pedal depressed Below 1 V
Clutch pedal released 10 16 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
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I31382
Push in Free
12
05778DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
943 Author: Date:
2004 COROLLA (RM1037U)
3 INSPECT CLUTCH SWITCH ASSY
(a) Disconnect the clutch switch assy connector.
(b) Check continuity between terminal 1 and 2 of clutch
switch assy.
OK:Clutch Switch Assy Position Specification
Switch pin free No continuity
Switch pin pushed in Continuity
NG REPLACE CLUTCH SWITCH ASSY
OK
4 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND GAUGE FUSE)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and gauge
fuse (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24201
Instrument Panel J/B
I10Ignition SW
Engine Room J/B
Battery
FL MAIN
ALT
IG1 Relay
AM1IG1
J7J/C
+BC14
RH J/B
2
IG
A
IA
IF
6
3B
IF
B
WB
5
1A
1
23
1
112
2
21
IF
9
IB
1 AM1
ECUIG
IH
10
BW
BW5
3B
W
C14
16
GND
WBA
J6J/C
IE
4B14
4B21
CenterJ/B
WBW
W
1C
1
1D
1
W
WB
Cruise ControlECU Assy
BY
W
2 1
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05779
944 Author: Date:
2004 COROLLA (RM1037U)
ECU POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTIONThe cruise control ECU assy power source supplies power to the actuator and sensors, etc., when terminal
GND and the case of the cruise control ECU assy are grounded.
WIRING DIAGRAM
0527C06
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39/48
I32648
ECUIG
Fuse
Instrument Panel J/B
I30401
GND ()
+B (+)
05780DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
945 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 CHECK FUSE(ECUIG)
(a) Remove the ECUIG fuse from the instrument panel J/B.
(b) Check the continuity of the ECUIG fuse.
OK: Continuity
NG REPLACE FUSE
OK
2 INSPECT TERMINAL VOLTAGE(B)
(a) Remove the cruise control ECU assy with connector still
connected.
(b) Turn the ignition switch to ON.
(c) Measure voltage between terminals 2 (B) and 16 (GND)
of the cruise control ECU assy connector.
OK:
Voltage: 10 16 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
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I30401
GND
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05781
946 Author: Date:
2004 COROLLA (RM1037U)
3 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND BODY GROUND)
(a) Measure resistance between terminal 16 (GND) of the
cruise control ECU assy connector and body ground.
OK:Resistance: Below 1
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPAIR HARNESS AND CONNECTOR BETWEEN CRUISE CONTROL ECU ASSYAND BATTERY
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I24197
Cruise Control ECU Assy
WB
CRUISECANCEL
SET/
COAST
RESUME/
ACC
11
2
A
J6
J/C
CCS
C10
Cruise Control Main Switch Assy
ECC
CCS
IE
C14
WB21
4B
12
4B
Center J/B
GY
3
05782DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
947 Author: Date:
2004 COROLLA (RM1037U)
CRUISE CONTROL SWITCH CIRCUIT
CIRCUIT DESCRIPTIONThis circuit carries the SET/COAST, RES/ACC and CANCEL signals (each voltage) to the cruise control ECU
assy.
WIRING DIAGRAM
057SJ02
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42/48
Input Signal Indicator LightBlinking Pattern
SET/COASTSwitch
RES/ACCSwitch
CANCEL Switch
2 PulsesON
OFF
ON
OFF
3 Pulses
ON
OFF
SW OFF
SW ON
I30401
CCS (+)
DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05783
948 Author: Date:
2004 COROLLA (RM1037U)
INSPECTION PROCEDURE
1 INPUT SIGNAL CHECK
(a) See input signal check on page 05745.
(b) Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:
SET/COAST, RESUME/ACCEL switch:
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch:
The indicator light goes off when the cancel switch is
turned ON.
OK WAIT AND SEE
NG
2 INSPECT TERMINAL VOLTAGE(CCS)
(a) Remove the cruise control ECU assy with the connector
being connected.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between terminals 11 (CCS) of the
cruise control ECU assy connector and the body ground
when each control switch is operated.
OK:
Switch Position Voltage
Neutral 10 16 V
CRUISE ONOFF Below 0.5 V
RES/ACC 2.3 4.5 V
SET/COAST 4.5 8.1 V
CANCEL 6.6 11.4 V
NG PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE(See page 05754)
OK
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I32737
RES/ACC
CANCELSET/COAST
ECC CCS
05784DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
949 Author: Date:
2004 COROLLA (RM1037U)
3 INSPECT CRUISE CONTROL MAIN SWITCH ASSY
(a) Remove the steering wheel center pad (See page
508).
(b) Disconnect the control switch assy connector.
(c) Check continuity between terminals 2 (CCS) and 3 (ECC)of control switch assy connector when cruise control main
switch assy is held ON and OFF.
OK:
Switch Position Resistance
Neutral (No continuity)
CRUISE ONOFF 0 (Continuity)
RES/ACC 210 270
SET/COAST 560 700
CANCEL 1,380 1,700
NG REPLACE CRUISE CONTROL MAIN SWITCHASSY
OK
4 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL MAINSWITCH ASSY AND BODY GROUND)
(a) Check for open and short circuit in harness and connector between cruise control main switch assy
and body ground (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
5 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND CRUISE CONTROL MAIN SWITCH ASSY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and cruise
control main switch assy (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
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DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05785
950 Author: Date:
2004 COROLLA (RM1037U)
6 INPUT SIGNAL CHECK(See step 1)
OK WAIT AND SEE
NG
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24226
Cruise Control ECU AssyD1DLC 3 Center J/B
TC
CG
PB
WB
TC
J6J/C
A
IE
10
C14
3
4C
16
4B
2
13
21
4
PB4C
4BWB
F40034
DLC3
1 2 3
10 11 1312
4 5 6 7 8
159 1614
CG
Tc
05788DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
953 Author: Date:
2004 COROLLA (RM1037U)
DIAGNOSIS CIRCUIT
CIRCUIT DESCRIPTIONThis circuit sends a signal to the cruise control ECU assy that DTC output is required.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT DLC3 TERMINAL VOLTAGE
(a) Turn the ignition switch to ON.
(b) Measure voltage between terminals 13 (Tc) and 4 (CG) of
DLC3.
OK:
Voltage: 10 16 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
0527F05
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DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05789
954 Author: Date:
2004 COROLLA (RM1037U)
2 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND DLC3)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and DLC3
(See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)
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I24202
Instrument Panel J/B
PIC14
5GR
Cruise Control ECUAssy
Engine Room J/B and R/B
Battery
FL MAIN
AM2 IG2
MAIN
CRUISE
AM2
2332
BO5 8
6 3 2
IMB
1A 1
IA4BR
IL IK
IM BR
BR
1
1
2
5 6
BW
B
C9 Combination MeterAssembly
I10 Ignition Switch
I30401
PI (+)
05786DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
951 Author: Date:
2004 COROLLA (RM1037U)
CRUISE MAIN INDICATOR LIGHT CIRCUIT
CIRCUIT DESCRIPTIONWhen the cruise control main switch assy button is turned to ON, CRUISE main indicator light comes on.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT TERMINAL VOLTAGE(PI)
(a) Turn the ignition switch to ON.
(b) Measure voltage between terminal 5 (PI) of cruise control
ECU assy and body ground, when the cruise control main
switch button is ON and OFF.
OK:
Cruise Control Switch Button Position Voltage
OFF 10 16 V
ON Below 1.2 V
OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE (Seepage 05754)
NG
0527E05
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DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)
05787
2 INSPECT COMBINATION METER ASSY (See page 05638)
NG REPLACE COMBINATION METER ASSY
OK
3 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSYAND COMBINATION METER ASSEMBLY)
(a) Check for open and short circuit in harness and connector between cruise control ECU assy and com-
bination meter assembly (See page 0130).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 0130)